This is false. Light trucks are definitely regulated. Emissions regs do soften a bit for 3/4 ton and up trucks (think F250 and up), but the ubiquitous F150 as

This is false. Light trucks are definitely regulated. Emissions regs do soften a bit for 3/4 ton and up trucks (think F250 and up), but the ubiquitous F150 as well as other half-tons, as well as mid-size trucks, are all very much regulated.